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hunterbold234 · 3 years ago

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Merge Excel Files In Python

How to move data from one Excel file to another using Python The Use Case. We have an Excel workbook that contains 2019 reported sales for 28 stores across the US. Step 1 — Import the Pandas library. I will open Visual Studio Code and create a new file. I will save that file as. Merge Two Files in Python. To merge two files in python, you have to ask from user to enter name of the first and second file, and then ask a file name to create a file to place the merged content of the two file into this newly created file.

Merge Excel Files In Python Free

Python Read Multiple Excel Files

EasyXLS Excel library can be used to export Excel files with Python on Windows, Linux, Mac or other operating systems. The integration vary depending on the operating system or if the bridge for .NET Framework of Java is chosen:

1. EasyXLS on Windows using .NET Framework with Python

2. EasyXLS on Linux, Mac, Windows using Java with Python

EasyXLS on Windows using .NET Framework with Python

If you opt for the .NET version of EasyXLS, the below code requires Pythonnet, a bridge between Python and .NET Framework.

Step 1: Download and install EasyXLS Excel Library for .NET

To download the trial version of EasyXLS Excel Library, press the below button:

If you already own a license key, you may login and download EasyXLS from your account.

Step 2: Install Pythonnet

For the installation you need to run 'pip' command as it follows. Pip is a package-management system used to install and manage software packages written in Python. <Python installation path>Scripts>pip install 'pythonnet.whl'

Step 3: Include EasyXLS library into project

EasyXLS.dll must be added to your project. EasyXLS.dll can be found after installing EasyXLS, in 'Dot NET version' folder.

Step 4: Run Python code that merges cells in Excel sheet

Execute the following Python code that exports an Excel file with merge cells.

EasyXLS on Linux, Mac, Windows using Java with Python

If you opt for the Java version of EasyXLS, a similar code as above requires Py4J, Pyjnius or any other bridge between Python and Java.

Step 1: Download and install EasyXLS Excel Library for Java

To download the trial version of EasyXLS Excel Library, press the below button:

If you already own a license key, you may login and download EasyXLS from your account.

Step 2: Install Py4j

For the Py4j installation you need to run 'pip' command as it follows. Pip is a package-management system used to install and manage software packages written in Python. <Python installation path>Scripts>pip install 'py4j.whl'

Step 3: Create additional Java program

The following Java code needs to be running in the background prior to executing the Python code.

Step 4: Add py4j library to CLASSPATH

py4j.jar must be added to your classpath of the additional Java program. py4j.jar can be found after installing Py4j, in '<Python installation path>sharepy4j' folder.

Step 5: Add EasyXLS library to CLASSPATH

EasyXLS.jar must be added to your classpath of the additional Java program. EasyXLS.jar can be found after installing EasyXLS, in 'Lib' folder.

Step 6: Run additional Java program

Start the gateway server application and it will implicitly start Java Virtual Machine as well.

Step 7: Run Python code that merges cells in Excel sheet

Execute a code as below Python code that exports an Excel file with merge cells.

Related sections

See also

How to format Excel cells?

How to export to XLSX file?

How to export to XLSM file?

How to export to XLSB file?

How to export to XLS file?

Related methods

ExcelTable.easy_mergeCells ExcelTable.easy_removeCellMerging ExcelTable.MergeCellRangesCount ExcelTable.easy_getCellMergingFirstRow ExcelTable.easy_getCellMergingFirstCol ExcelTable.easy_getCellMergingLastRow ExcelTable.easy_getCellMergingLastCol

Withthe help of openpyxl module we can also write to excel file in python.The process is somewhat similar to reading an excel spreadsheet inpython. With python Excel writer, we will Create excel sheets, write text, numbers and formula in cells. After modifying we will save workbook. We will also add and delete sheets in a an excel workbook, apply setting, fonts and styles, set width and height of cells and areas, merge and unmerge cells. We can create any type of excel file, having hundredsand thousands of columns and rows of data. Writing to excel files is anecessity which no one can deny. There may be many cases for allprofessionals from a computer operator to a data scientist that one hasto write to an excel spreadsheet in python. Here is the solution.

If you want to Read, Write and Manipulate(Copy, cut, paste, delete or search for an item etc) Excel files in Python with simple and practical examples I will suggest you to see this simple and to the point Excel Openpyxl Course with examples about how to deal with MS Excel files in Python. This video course teaches efficiently how to manipulate excel files and automate tasks.

Everything you do in Microsoft Excel, can be automated with Python. So why not use the power of Python and make your life easy. You can make intelligent and thinking Excel sheets, bringing the power of logic and thinking of Python to Excel which is usually static, hence bringing flexibility in Excel and a number of opportunities.

Python Excel Create and Save files:

First we will learn how to create and save excel files with python.First we will create an excel file.

First step will be to import openpyxlmodule.

>>> import openpyxl

Next we will create an excel file ortechnically a Workbook.

>>> mywb =openpyxl.Workbook()

The above code will create a work book with one sheet in the beginning.We can check the number of sheets with the following code, see whichsheet is active and what is the title of the active sheet. In this casewe have only one sheet, hence it will be the only answer.

>>>mywb.get_sheet_names()

('Sheet')

>>> sheet =mywb.active

>>> sheet.title

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'Sheet'

We can also set the title of thesheet, see the example given below.

>>>sheet.title = 'MyNewTitle'

>>>wb.get_sheet_names()

('MyNewTitle')

>>>mywb.save('NewExcelFile.xlsx')

If you open your root folder orcurrent working directory, you will find a new excel file, with nameNewExcelFile, having one sheet with title MyNewTitle.

Loading an already existing excel file in Python and saving acopy of it:

Whenever you load an already existing Excel file in memory, and modifythe contents, either sheets or cells, or creating whole sheets, ordeleting sheets, or any modification which could be done, you will haveto call save( ) method to save the file. If you don't do so, anymodification will be lost.

>>> import openpyxl

>>>mywb = openpyxl.load_workbook('filetest.xlsx')

>>>sheet = mywb.active

>>>sheet.title = 'Working on Save as'

>>>mywb.save('example_filetest.xlsx')

In the code above you noticed that weloaded already existing file, changed sheet title and saved its copywith a different name. In this case original file plus this new filewill be in your working directory, which is usually your python rootfolder. Open it and see the new copy.

When you work on an excel spreadsheetin python, its always better to save it with a different file name, sothat the original is always there, in case any mishap happens, forexample any bug in code, or mistake in saving, or writing.

Creating and Removing Sheets in Excel:

For creating new sheets in aworkbook, we use create_sheet( ) method.

For deleting a sheet we useremove_sheet( ) method.

>>>importopenpyxl

>>> mywb =openpyxl.Workbook()

>>> mywb.get_sheet_names()

('Sheet')

>>>mywb.create_sheet()

>>> mywb.get_sheet_names()

('Sheet', 'Sheet1')

>>>wb.create_sheet(index=0,)

>>>mywb.get_sheet_names()

('1st Sheet', 'Sheet', 'Sheet1')

>>>mywb.create_sheet(index=2,title='2ndSheet')

>>>mywb.get_sheet_names()

('1st Sheet', 'Sheet', '2nd Sheet','Sheet1')

Create sheet creates a new sheet,which is by default the last sheet in the workbook. However, we canspecify the position of the new sheet with index number and we can alsopass a string as the title of new sheet. Keep in mind, the first sheetwill have index 0, second will have index 1 and so on.

Removing sheets from Excel Workbook:

When we want to remove any specificsheet from an excel workbook, we will use method remove_sheet( )

>>>mywb.get_sheet_names()

('1st Sheet', 'Sheet', '2nd Sheet','Sheet1')

This is to see the number of sheets and their names, now working withremoving or deleting sheets.

>>>mywb.remove_sheet(mywb.get_sheet_by_name('1st Sheet'))

>>>mywb.remove_sheet(mywb.get_sheet_by_name('Sheet1'))

>>>mywb.get_sheet_names()

('Sheet', '2nd Sheet')

It is very obvious that afterdeleting the two sheets from four sheets, only two sheets are left.remove_sheet method takes a worksheet object not name of the sheet,instead of creating an object to that specific worksheet and thenremoving it, we call get_sheet_by_name( ) and pass it the name ofsheet, the value it returns is the input argument of remove_sheet( )method. In the end, use save( ) method to save the file aftermodification. In this case removal of worksheets.

Python excel Writing Values in Cells:

Now we will see how to write valuesto particular cells in an excel worksheet. Ofcourse we should know theaddress of the cell where we want to write.

>>> import openpyxl

>>> mywb =openpyxl.Workbook()

>>> mysheet =mywb.get_sheet_by_name('Sheet')

>>> mysheet('F6') ='Writing new Value!'

>>> mysheet('F6').value

'Writing new Value'

Python Excel setting Fonts:

Applying different styles to yoursheet, emphasizes or stresses certain rows or columns. It is veryimportant to apply certain uniform styles to your excel sheets so thatit brings clarity in reading the data. If you have hundreds orthousands of rows of data, styling can be a hectic job, however, withour python code, you can write a few lines of code and apply onmillions of lines of data instantly. But take care, first stylingshould be with absolute care, and second always save excel workbookwith a different name.

First we will import openpyxl, and then import Font and Style for usein our code.

Here’s an example that creates a newworkbook and sets cell F6 to have a 32-point, italicized font.

>>>importopenpyxl

>>>fromopenpyxl.styles import Font, Style

>>>mywb= openpyxl.Workbook()

>>>mysheet= mywb.get_sheet_by_name('Sheet')

>>>italic32Font = Font(size=32, italic=True)

>>>sobj = Style(font=italic24Font)

>>>mysheet('F6').style = sobj

>>>mysheet('F6')= 'Applying Styles!'

>>>mywb.save('Appliedstyle.xlsx')

In openpyxl for excel worksheets eachcell has a style object which is in style attribute of the cell. Wecreate a style object and assign it to style attribute.

There are four arguments for Font objects

Name: A string value is used, quoting the font name, like'Arial'.

Size: An integer value, quoting the size.

Bold: A boolean value, True for Bold font.

Italic: Boolean value, True for Italic font.

In the example below we will call Font( ) method to create a Fontobject and store it in a variable, next step will be to pass that as anargument to Style( ) method. We will store the that object in anothervariable and assign it to the specific cell object.

>>> import openpyxl

>>> fromopenpyxl.styles import Font, Style

>>> mywb =openpyxl.Workbook()

>>> mysheet =mywb.get_sheet_by_name('Sheet')

>>> firstFontObj =Font(name='Arial',bold=True)

>>> firstStyleObj =Style(font=firstFontObj)

>>>mysheet('F6').style/firstStyleObj

>>> mysheet('F6') ='Bold Arial'

>>> secondFontObj =Font(size=32, italic=True)

>>> secondStyleObj =Style(font=secondFontObj)

>>>mysheet('D7').style/secondStyleObj

>>> mysheet('D7') ='32 pt Italic'

>>>mywb.save('ApplicationofStyles.xlsx')

Python ExcelWriting Formulae:

Formulae in Excel are very important, infact the power of a spreadsheetis in its formulae. Openpyxl provides the utility of writing formula inany specific cell. Infact it is very much easy, instead of writing anumber or text, write an equal sign followed by the required formula. >>>mysheet('F6')= '=Sum(D7:D20)'

This formula will sum up all valuesfrom D7 to D20 and store in F6 cell.

Some more examples:

>>> import openpyxl

>>> mywb =openpyxl.Workbook()

>>> mysheet =mywb.active

>>> mysheet('F6') =500

>>> mysheet('F7') =800

>>> sheet('D3') ='=SUM(F6:F7)'

>>>mywb.save('Applyingformula.xlsx')

In the above example we put 500 inF6, and 800 in F7 cell. Cell D3 has a formula of adding up F6 and F7.When you will open spreadsheet, it will show a value of 1300 in D3.

The cells in A1 and A2 are set to 200and 300, respectively.The value in cell A3 is set to a formula that sums the values in A1 andA2.When the spreadsheet is opened in Excel, A3 will display its value as500.

Excel Adjusting Rows and Columns in a Sheet:

We can set Row heigh, column width in excel spreadsheet using openpyxl.We can also freeze rows or columns so that they always appear. We canalso hide rows or columns.

>>> import openpyxl

>>> mywb =openpyxl.Workbook()

>>> mysheet =mywb.active

>>> mysheet('F6') ='Tall row'

>>> mysheet('D7') ='Wide column'

>>> mysheet.row_dimensions(3).height= 65

>>>mysheet.column_dimensions('F').width= 25

>>>mywb.save('Heightandwidth.xlsx')

Thedefault row height in excel spreadsheet is 12.75 points. Where onepoint is equal to 1/72 of an inch. You can set a value between 0 to 409. Column width can be set to a value from 0 to 255. It can be either aninteger or a floating value (decimal number). If you set 0 width forcolumn or 0 height for rows, it will be hidden.

Excel Merging and unmerging

openpyxl allows us to merge andunmerge cells in a workbook.

>>> import openpyxl

>>>my wb =openpyxl.Workbook()

>>> mysheet =mywb.active

>>>mysheet.merge_cells('B2:D3')

>>> mysheet('A1') ='cells mergedtogether.'

>>> mysheet.merge_cells('F6:F7')

>>> mysheet('G5') ='Two merged cells.'

>>> mywb.save('Mergingcells.xlsx')

merge_cells method takes two celladdresses as its arguments. First cell is the top left and second cellis the right bottom of the rectangular area that is to be merged. If wewant to set value of that merged area, we use the address of top leftcell of the whole merged area.

If you want to unmerge cells, use theidea below.

>>> import openpyxl

>>> mywb =openpyxl.load_workbook('Mergingcells.xlsx')

>>> mysheet =mywb.active

>>>mysheet.unmerge_cells('B2:D3')

>>> mysheet.unmerge_cells('F6:F7')

Merge Excel Files In Python Free

Retroarch on chromebook app. >>> mywb.save('unmerged.xlsx')

Python Read Multiple Excel Files

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